Phase diagrams of the systems Ln2S3-Ln2O3 (Ln = Gd, Dy)

For the first time, the phase diagrams of the systems Gd 2 S 3 -Gd 2 O 3 and Dy 2 S 3 -Dy 2 O 3 were constructed within the temperature range from 870 K to the melting point. In the systems, compounds Gd 2 O 2 S and Dy 2 O 2 S form in hexagonal symmetry with the unit cell parameters a = 0.3858 nm, c...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2013-06, Vol.58 (6), p.724-727
Main Authors: Andreev, P. O., Fedorov, P. P.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Construction
Dysprosium
Eutectics
Inorganic Chemistry
Melts
Microhardness
Phase diagrams
Physicochemical Analysis of Inorganic Systems
Symmetry
Unit cell
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Summary:For the first time, the phase diagrams of the systems Gd 2 S 3 -Gd 2 O 3 and Dy 2 S 3 -Dy 2 O 3 were constructed within the temperature range from 870 K to the melting point. In the systems, compounds Gd 2 O 2 S and Dy 2 O 2 S form in hexagonal symmetry with the unit cell parameters a = 0.3858 nm, c = 0.6667 nm and a = 0.3802 nm, c = 0.6591 nm, respectively. The compounds melt congruently at 2430 and 2370 K, respectively. Their microhardnesses are 4900 and 5150 MPa, respectively. The coordinates of eutectics are the following: 21 mol % Gd 2 O 3 , T eu = 1875 K; 83 mol % Gd 2 O 3 , T eu = 2270 K; 20 mol % Dy 2 O 3 , T eu = 1780 K; and 81 mol % Dy 2 O 3 , T eu = 2220 K.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023613060028